diff --git a/doc/erko_howto_tools.txt b/doc/erko_howto_tools.txt
index 95e7cbfac3bfd78084c032cb2858754a14847e10..97487abd2dadbbebb9c1daec1b3f5e622a60c561 100755
--- a/doc/erko_howto_tools.txt
+++ b/doc/erko_howto_tools.txt
@@ -272,6 +272,16 @@ sdp_rw.py --host 10.99.0.250 --port 4842 -r firmware_version
 sdp_firmware.py --host 10.99.0.250 --port 4842 -n 64:79 --reboot --image USER
 sdp_rw.py --host 10.99.0.250 --port 4842 -r firmware_version
 
+# dop421: 1GbE test
+sdp_rw.py --host localhost --port 4840 -r firmware_version
+sdp_firmware.py --host localhost --port 4840 -n 0 --reboot --image FACT
+sdp_rw.py --host localhost --port 4840 -r firmware_version
+sdp_firmware.py --host localhost --port 4840 -n 0 --write --image USER --file ../unb2c_test_1GbE_II.rbf
+sdp_rw.py --host localhost --port 4840 -r firmware_version
+sdp_firmware.py --host localhost --port 4840 -n 0 --reboot --image USER
+sdp_rw.py --host localhost --port 4840 -r firmware_version
+
+
 # MTU wijzigen (when statistics packets get lost, show as Rx error in ifconfig)
 sudo ifconfig enp67s0f1 10.99.0.249 netmask 255.255.0.0 mtu 9000 up